Wrench



Sept 4, 1945. H. c. REYNOLDS WRENCH INV ENTQR Harold (119 0 HISATTORNEY.

Patented Sept. 4, 1945 WRENCH Harold C. Reynolds, Athens, Pa., mignor toingersoll-Rand Company, New York, N. Y., a cor poration of New JerseyApplication August 31,: 1944, Serial No. 552,025

-' 2 Claims. (Cl. 192-450) This invention relates to wrenches, andparticularly to wrenches driven by fluid actuated motors.

One object of the invention is to provide a construction for a wrenchwhich will develop torque limited to a predetermined maximum value.

Another object of the invention is to provide an adjustment by which themaximum torque of a motor driven wrench may be varied as desired.

Another object of the invention is to provide a relatively simple andinexpensive construction for amotor driven wrench which is adapted toautomatically stop the motor when a predetermined torque is reached.

Other objects of the invention will be in part obvious and inpartpointed out hereinafter.

In the drawing in which similar reference characters refer to'similarparts, I v

Fig. 1 is a side view of a wrench constructed in accordance with thepractice of the invention,

Fig.2 is a cross sectional view of the front end of the tool taken alongthe line 2-2 of Fig. 1

looking in the direction of the arrows,

indicate more clearly the connection with "a suitable supply of motivefluid (not shown) a nipple i9 and a shutoff valve 24 are shown coupledto the backhead H1 at the port ll. v

The rotor of the motor is provided with a shaft 2i extending intothe'gearing box II and is adapted to'drive through suitable planetarygearing 22 a shaft 23. Within the shaft housing I2 is disposed alongitudinally-extending shaft 24 journalled on an antifriction bearing25in a bore 24 of the housing l2 and on a second antifriction bearing2'! provided adjacent the outer end of the shaft 24 andslidably-inounted in a bore 24 in the casing l2.

Shaft 24 is adapted to slide with its bearings-in the bores 28 and 28but'is opposed in such motion by the compressive force of a spring 29arranged Fig. 3 is a horizontal longitudinal section of the forward endof the tooltaken along the line 3-3 of Fig. 1 looking in the directionof the arrows.

Fig. 4 is a cross section through the spring compressing adjustmenttaken at the line 4-4 of Fig. 3,

Fig. 5 is a cross sectional view through the throttle valve and casingof the, tool taken along y the line 5-5 of Fig. 1 looking in thedirection of.

the arrows,

Fig. 6 is a detail view of the stem of the throttle valve and itsoperating mechanism taken along the line 86 of Fig. 5-looking in thedirection of the arrows, portions of the casing being shown in section,and I Fig. 7 is a cross sectional view through the motor and thethrottle valve actuating means taken along the line 1-1 of Fig. 1looking in the direction of the arrows.

Fig. l is an external view of the wrench with portions of the interiormechanism shown in broken lines and shows the working parts of the toolto be inclosed in a casing comprising a motor housing iii, a gear casingH, and a casing l2 for the shaft to be described hereinafter. Motivepower for the tool is provided by vane-type motor having a rotor 14provided with theconventional vanes l 5. For controlling the flow ofmotive fluid to the motor there is provided a throttle valve l6 housedin the backhead ll! of the motor which controls the flow of motive fluidfrom an inlet port I! to a supply port l8 leading to the motor. To

about the shaft 24 and having a' forward abutment It shaped somewhatlike a cup and bearing against the race of the bearing 25. The rear'endof the spring '29 is disposed within a rearward abutment 3i slidable inthe bore 26 of the housing l2.

The shaft 24 is adapted tobe driven by shaft 22 and to this end acoupling member 22 is provided which is screwed into the end of theshaft'23 as.

shown at 33 and is provided with a bore 34 to receive the end of shaft24. Relative rotation between the two shafts is prevented by ball 34lying in a groove 34 in the shaft and a complementary groove 21 providedin the bore 34 of the coupling member 32. Ball 35 is adapted to permitrelative longitudinal movement of the coupling member 32 and the shaft24.

Compression of the spring 29 is adjustable by means for varying theposition of the abutment II and to this end there are provided aplurality of pins 38 (Fig. 4) extending into bores 39 of the abutment 3|and through the wall of the casing I 2 at suitable longitudinal slots 40to engage a threaded ring 4| encircling the casing i2. Longitudinalmotion of the ring 4| is accomplished by a nut 42 threaded to receivethe. ring 4| and having a rearward face 43 abutting a coupling 44forming part of casing l2 and threaded into it as shown at 45. Coupling44 provides a means of threadingly attaching the casing l2 to the gearhousing ll.

Shaft 24 is adapted to drive the socket receiving spindle 48 throughsortable worm gearing comprising the worm 49, formed integrally with theshaft 24, and the worm wheel I50 fitting the spindle 48 at a hexagonalportion 5!. Spindle 48 is suitably housed within an offset portion 52 ofthe casing l2 having a cap 53 supporting a miemve'u-thereuw mvidedwmechanism adaptedutorbeaactuated :both manually and zautomaticaliyrthrough? :tudinal motion :ottheshaitill. mechanism comprises e a;lhait-ll' extetiori;to 'the': tool-teasing and-substantially'paz'alielatozithe axistoi' r the tool 7 having a bearing inafbracket'fltat' thei'forwaxd EThe-value Zotflthetorque: required toovercome end of the casing t2 :and *m az-band i-lr suitably ciamped tothy meanszoiacontractingsbolt l8. a' sha'itiutis providedwithranarmll'normally crntactingthe end otthewalve H a I! which it isadaptemtobiaal'ltr'respon'ding movementioi theabutmentiil. i Snit- 'lever l2 forturning the shaitz and-ioperatingthe throttle valve 10, .Shait ill aviaz movahle z iou'giethesmotor.

' Upona stoppage: oh the: motonjaa delcrtbed andrremowairoizthewrenehairontheinutili apelng 5 $120 restoresv thebracket'll' to ita'normal' leeward @position. zin zlemn having been Mthe v'zbiasingzspringfl miahes'shaft'nlliomtdzto ib'ring ztheearm llx to"register 'ifll'ifllQL-IMFO 'z-valve I toneubsequent :operation.

*zthe:compression or the spring is determined =iandissadjustab1e bymeans. of xthe nut 41 which or retracts the ring-4 has desired andaoompresses thelspring' 2O accordingly by th coradjustment of theznutTux-may be \had thy apflyingxato'rque wrench of a ien-known a typeutowthe spindl andapplyingthedaind tudinally againstthepressui'eoLa-biaaingrmmg i-toequewto: it iyhile adjustment of thenutll is disengage the endaoi i t-hez. flardttlguyflyg 7 1.2991- :mittingit to close.

when moved :to" thefrear-so' asto wse' the throttle 'valvetheiapringfill is the lever i2 totitsrinormaloutwatdly-vextending 25*meanscf a screwillipassing through lthe l'casing I and =whenrm'ovedre'arwardly: 'iszzadapted xto E20 ifflmspby the above describedconstruction are accomplished; objects hereinbeiore u referrre'd to.

3. LA 'wrenchincluding a casing, a motornwlthini the caaing'g a shaftinsaid casing adapted to Athens-drivenlay saidmot0rv and to be moved&1!- mt saidr motor '.:by the torque thereof, :a throttle waive v forthe .motor," operative connec- I 2 at the' slot' there :being a sleeve'lbearing i1 @380 "tions': betwee'ni said :ahai't 'ands said -'va.lve to:re-

.provided on the-:screw 'l ll-i-toengage the avails oi 'the slot It.

' vided on the spindle-' to' 'engage aia'sifltahie nut In"operation, themotor :within' 'thecica'aing is actuated by 'depressingthei leveriltiwhich' by g means of the arm'lw'depresses' the throttle-waive e I 0'Qdmittingrmotiveiiuid': through ithe'supplmport it to l the motor. .Thetorque: of theF-motor is 40 for said-ring- -:abutting the casing.

transmitted through 1 the shaft ll :raand -:;gearing 22 x and shaft 23tothe ashaft il and thence through the :wormxgears 1 ll z-and; ll tozthespindie Resistance "offi'the .nut' I i tot-rotation. otithe x spindlecauses 'endfithrusti'iri'i'thexahafttflt in 5 the amotor, 1 inanuallyoperable "tor said I the direction 'towardthe= right,:=asshown :in the tt figures. This end #thrustaistransmittedtthrough flange I!v tothevbearing'ill and the tomardwabutmenttltendingto compressrthet'springlli. --As the end thrust becomes:greaterathescompressive 450'Iwisermovement .and means to adiustnthevcomforce of the spring" 29isovercome,= lmshing' the abutment 30 rearwardly andthroughithemracketII also pushing theshaftltrearwandly. f-Atsa. predetermined torque ofthe shaft 14' thew-degree :leasethevvalve iuponeisaidaendwise movement,a

nadiustthexcompreesion or said spring including I Ho tightening orJooseningas 'the:-case may::=be.' 85 r aniabntmentfimember within"the-:casing, :mem-

members,.- andxan vadjusting-nut :exteriorly of the 2 2.fA=wreiich'including acasing, a'motor'withsin the casing, azshattc/insaidwcasing adapted to t':be driven by saidv motor and to bemoved endwises-byatheitorque:thereoi, a throttl valve forvalve,"-'operative' connectinns:'=between aaid ahaltxandsaidwmanuallyoperated means toutdiaengage :said vaiveiuponsaidendwise'movement, I'lfl'llll flabout said 1 shaft and adapted to resistsaid endepression: of: said spring including an abutment "member-withinthe casing, members extending z'through the casing tor-engagethenabutment and :tor-prevent'rrotation thereof, a threaded rinrenoilongitudinal motion of th -shaft visisuch as 'I55tagagingthe outer endsotsaid members, 'andian to cause the bracketill to'rpush-the-shait' ltand its arm 60 sui'iiciently far. bacle tofdisengagethe throttle valve[8 whereupon'the. valve rcloaesa'un- ,;ad-iusting::nut for saidrringrotatableon th -eb' 'i'teriorioi andabutting thercasing.

HAROLD C. REYNOLDS.

